RAM instead HDD/SSD.
hyperossystems.co.uk
hyperossystems.co.uk
http://www.newegg.com/Product/Product.aspx?Item=N82E16820148...
If you want high speed ram-based drives, FusionIO is the way to go
It's an intriguing piece of hardware, I am waiting for some reviews.
It also offers 100% secure file deletion (disconnect both the external and the internal power!). Flash drives can't offer this. Hard disks suffer from magnetic remnance and so retain their data even after they have been overwritten several times! But the HyperDrive5 is forensically wiped every time the power is fully disconnected
Wait a minute, if the drive gets accessed quickly or if it's really cold, RAM actually retains its contents. You can't expect the charges to suddenly revert to randomness!
Plus, this presents a major issue if someone wanted to sabotage you... If it's really that easy to clear the contents, someone may just come and clear it for you while you aren't looking.
On the top of my list as a consumer grade drive (thou, we're considering to put it into the Win2008/SQLServer server on our LAN ) is OCZ Revodrive X2 PCI-Express SSD (http://www.ocztechnology.com/ocz-revodrive-x2-pci-express-ss...).
There are also other options than the one linked:
http://www.ddrdrive.com/ - pcie card, favored by many people running ZFS
http://us.test.giga-byte.com/Products/Storage/Products_Overv... - Gigabyte's i-RAM, very similar to what's linked.